Effects of tree species and soil physico-chemical conditions on the nature of soil organic matter

Howard, P. J. A.; Howard, D. M.; Lowe, L. E.

doi:10.1016/s0038-0717(97)00138-7

Cited by 61 publications

(33 citation statements)

References 29 publications

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“…Therefore, the qualitative and quantitative composition of humic substances can change depending on the origin and the degree of maturity. As reported in literature (ALEKSANDROVA 1980;ZAUJEC et al 1996;HOWARD et al 1998;GONET & DEBSKA 1999), the chemical composition of the plant material is a major factor shaping the properties of the humic substances produced and the course of humification process. One of the parameters changing in the humification process is the degree of polydispersity of humic substances molecules (ALEKSANDROVA 1980;DEBSKA et al 2005) and the proportions of hydrophobic and hydrophilic fractions (DEBSKA 2004).…”

mentioning

confidence: 89%

Molecular size distribution and hydrophilic and hydrophobic properties of humic acids isolated from forest soil

Dębska¹,

Drąg²,

Banach-Szott³

2007

Soil & Water Res.

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Abstract:The aim of the present paper was to determine hydrophilic and hydrophobic properties and the degree of polydispersity of humic acids depending on their degree of maturity and the properties of the plant material participating in the process of humification. The study involved humic acids isolated from samples taken from organic and mineral horizons of forest soils. The samples were taken under the tree stands of: pine with an admixture of hardbeam, European beech, elm, fir, spruce, and thuja. It was demonstrated that the properties of humic acids of the organic horizon and mineral horizons are determined by the kind of plant litter, mainly by the tree species. The humification process is connected with an increase of the proportion of humic acids of lower molecular size as compared to the proportion of molecules greater in size, and with an increase of hydrophilic fractions and a decrease of hydrophobic fractions. Based on the correlation relationships, it was shown that the degree of polydispersity of molecules of humic acids is related to their hydrophilic and hydrophobic properties. Humic acids with a larger proportion of high-molecular fractions demonstrate also a higher proportion of hydrophobic fractions.

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confidence: 89%

Molecular size distribution and hydrophilic and hydrophobic properties of humic acids isolated from forest soil

Dębska¹,

Drąg²,

Banach-Szott³

2007

Soil & Water Res.

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“…Many studies (e.g., [18,31,33,41]) have suggested that tree species have different impacts on soil C pools and dynamics. However, No significant differences in soil total C were observed between the plantations, indicating that tree species did not have significant impacts on soil total C, at least in the 33 years period after conversion.…”

Section: Detritus Carbon Poolsmentioning

confidence: 99%

Conversion of a natural broad-leafed evergreen forest into pure plantation forests in a subtropical area: Effects on carbon storage

et al. 2005

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-For the last several decades, native broad-leafed forests in many areas of south China have been converted into plantations of more productive forest species for timber use. This paper presents a case study examining how this forest conversion affects ecosystem carbon storage by comparing 33 year-old plantations of two coniferous trees, Chinese fir (Cunninghamia lanceolata, CF) and Fokienia hodginsii (FH) and two broadleaved trees, Ormosia xylocarpa (OX) and Castanopsis kawakamii (CK), with an adjacent relict natural forest of Castanopsis kawakamii (NF, ~150 year old) in Sanming, Fujian, China. Overall estimates of total ecosystem carbon pools ranged from a maximum of 399.1 Mg ha -1 in the NF to a minimum of 210.6 Mg ha -1 in the FH. The combined tree carbon pool was at a maximum in the NF where it contributed 64% of the total ecosystem pool, while the OX had the lowest contribution by trees at only 49%. Differences were also observed for the carbon pools of undergrowth, forest floor and standing dead wood, but that these pools together represent at the most 5% of the ecosystem C stock. Total C storage in the surface 100 cm soils ranged from 123.9 Mg ha -1 in the NF to 102.3 Mg ha -1 in the FH. Significant differences (P < 0.01) in SOC concentrations and storage between native forest and the plantations were limited to the surface soils (0-10 cm and 10-20 cm), while no significant difference was found among the plantations at any soil depth (P > 0.05). Annual aboveground litterfall C ranged from 4.51 Mg ha -1 in the CK to 2.15 Mg ha -1 in the CF, and annual belowground litterfall (root mortality) C ranged from 4.35 Mg ha -1 in the NF to 1.25 Mg ha -1 in the CF. When the NF was converted into tree plantations, the vegetation C pool (tree plus undergrowth) was reduced by 27-59%, and the detritus C pool (forest floor, standing dead wood, and soils) reduced by 20-25%, respectively. These differences between the NF and the plantations may be attributed to a combination of factors including more diverse species communities, more C store types, higher quantity and better quality of above-and belowground litter materials under the NF than under the plantations and site disturbance during the establishment of plantations.carbon storage / carbon input / natural forest / monoculture plantation Résumé -Conversion d'une forêt naturelle feuillue en plantations forestières pures en zone subtropicale : effets sur le stockage de carbone. Dans les dernières décades, dans beaucoup de zones de la Chine du Sud, des forêts feuillues naturelles ont été transformées en plantations plus productives en bois. Cet article présente une étude de cas examinant comment cette conversion forestière affecte le stockage de carbone dans l'écosystème. L'étude compare des plantations âgées de 33 ans de deux conifères, Cunninghamia lanceolata (CF) et Fokienia hodginsii (FH) et deux feuillus, Ormosia xylocarpa (OX) et Castanopsis kawakamii (CK) avec une forêt naturelle relictuelle adjacente de Castanopsis kawakamii (NF), âgée d'environ 150 an...

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“…Interestingly, the slightest changes in the elemental composition of humic acids were noted in the molecules of the HAs of Fluvisols (samples no Fl9 and Fl10). Much precious information on the structure of HAs is provided by the values of the atomic ratios of the elements that are determined (Orlov 1986;Howard et al 1998;Gonet and Debska 1999;Debska et al 2012). It was shown that a decrease in the value of the H/C ratio indicates an increase in the degree of the aromaticity of humic acids, which, in turn, suggests an increase in their degree of humification (maturity).…”

Section: Elemental Composition Of Humic Acidsmentioning

confidence: 99%

“…Parameter O/C and O/H as well as ω are indicators of the oxidation of the molecules of humic acids. The higher the value of the O/C ratio, the higher the ω and the higher the degree of humification of humic acids (Gonet and Debska 1999;Howard et al 1998;Debska et al 2012). The elemental composition parameters discussed here can, therefore, be used to evaluate the degree of the advancement of the humification process of the soil organic matter, as well as the characteristics of the humus substances that are formed.…”

Section: Elemental Composition Of Humic Acidsmentioning

confidence: 99%

Effect of soil pollution with polycyclic aromatic hydrocarbons on the properties of humic acids

2014

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Purpose Interestingly, soil is the component of the natural environment in which most hydrophobic organic pollution including polycyclic aromatic hydrocarbons (PAHs) gets accumulated. The aim of the present paper was to determine the effect of soil pollution with PAHs on the elemental composition, spectral properties, and hydrophobic and hydrophilic properties of humic acids. The research was performed on different types of soil samples that were artificially polluted with selected PAHs (anthracene, pyrene, fluorene and chrysene). Materials and methods The soil samples were polluted with s e l e c t e d PA H s i n a n am ou n t c or r e s p o nd i n g t o 10 mg PAHs kg −1 . The PAHs-polluted soil samples were incubated for 180 and 360 days at a temperature of 20-25°C and fixed moisture (50 % of field water capacity). Humic acids (HAs) were extracted from the soil samples prior to the incubation (additionally, soils not polluted with PAHs) and after 180 and 360 days of incubation. For isolated HAs, the following analyses were performed: elemental composition, UV-Vis and IR spectra, susceptibility to oxidation, and hydrophilic (HIL) and hydrophobic (HOB) properties were determined using high-performance liquid chromatography.Results and discussion The research demonstrated that introducing anthracene, fluorene, pyrene and chrysene to soil samples resulted in a change in some of the quality parameters of humic acids. However, the intensity and the direction of those changes were determined by soil properties. The changes of the parameters, once PAHs were introduced, that did not depend on the soil properties were ΔA 665u and ΔA 465u (susceptibility to oxidation at wavelengths of 465 and 665 nm) as well as HIL/ΣHOB. The same tendency in changes in the structure of humic acids, once PAHs were introduced, was also observed based on the Fourier transform infrared spectra pattern. Conclusions A single pollution of soils with PAHs that leads to changes in the quality parameters of humic acids shows that, as for the soils permanently exposed to pollution with those compounds, significant changes can occur in the properties of humic acids. As a result, it can lead to a change in the functions played by humic acids in the environment.

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Effects of tree species and soil physico-chemical conditions on the nature of soil organic matter

Cited by 61 publications

References 29 publications

Molecular size distribution and hydrophilic and hydrophobic properties of humic acids isolated from forest soil

Molecular size distribution and hydrophilic and hydrophobic properties of humic acids isolated from forest soil

Conversion of a natural broad-leafed evergreen forest into pure plantation forests in a subtropical area: Effects on carbon storage

Effect of soil pollution with polycyclic aromatic hydrocarbons on the properties of humic acids

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